Marinate the Chicken: Season the chicken thighs with salt, pepper, and grated garlic. Let the flavors infuse by marinating for at least two hours or overnight for the best result.
Prepare the Spicy Garlic Sauce: In a saucepan, melt the butter over medium heat. Add soy sauce, gochujang, gochugaru, mirin, honey, brown sugar, and minced garlic. Stir until the sauce thickens slightly, and the garlic is fragrant. Toss in the sesame seeds and optional cayenne pepper for more heat.
Coat the Chicken: After marinating, coat each piece of chicken in potato starch. This step ensures a crispy, light coating that complements the rich sauce.
First Fry: Heat your oil to 320°F (160°C). Fry the chicken pieces for 5 minutes, ensuring the oil fully covers them. Remove and let the chicken rest for a few minutes to let the heat escape.
Second Fry: Increase the oil temperature to 350°F (175°C). Fry the chicken for another 5 minutes until golden brown and super crispy.
Toss in Sauce: Toss the crispy chicken bites in the spicy garlic sauce until each piece is well-coated.
Garnish and Serve: Garnish with fresh green onions for a pop of color and serve with classic Korean sides like steamed rice, cheesy corn, or macaroni salad.